Year	thousand metric tons of CO2 equivalent
1970	1.8261976
1971	1.8269478
1972	1.8448131
1973	1.8220901
1974	1.821157
1975	1.8296076
1976	2.6258457
1977	2.7775194
1978	5.303201
1979	6.067785
1980	6.170271
1981	7.047013
1982	7.624574
1983	7.290487
1984	7.828492
1985	8.650364
1986	6.47466
1987	8.943996
1988	11.000443
1989	11.871481
1990	11.823462
1991	11.862274
1992	12.133462
1993	12.684115
1994	13.239976
1995	13.292831
1996	8.335714
1997	38.4276
1998	6.535978
1999	5.815693
2000	5.468121
2001	5.173776
2002	5.335968
2003	5.007275
2004	5.0127
2005	5.168971
2006	5.765411
2007	5.727219
2008	5.884513
2009	6.123027
2010	6.361541
2011	6.42515641
2012	6.48877182